CN106828076A - Electric wheel hub with wheel-side reduction device - Google Patents

Abstract

The invention discloses an electric wheel hub with a wheel-side reduction device, which comprises a wheel-hub main shaft, a wheel hub rotatably fitted on the wheel-hub main shaft, a wheel-hub motor and a wheel-side reduction device arranged in the wheel hub, the wheel side The speed reduction device includes a central gear that is rotatably fitted to the hub main shaft, an internal ring gear fixed coaxially with the hub, and a plurality of double gears distributed around the hub main shaft, and the central gear is used to output the hub motor The power is distributed to the large gear of each dual gear, and the pinion of each dual gear meshes with the inner ring gear. The fixed-axis electric hub of the present invention has a simple structure, compact component assembly, and high support rigidity , Large reduction ratio, high power, good lubrication function, long service life.

Description

Electric hub with wheel side reduction

technical field

The invention belongs to the field of electric wheel hub driving devices, and in particular relates to an electric wheel hub with a wheel-side reduction device.

Background technique

The wheel reducer is to improve the driving force of the car to meet or correct the power matching of the entire transmission system. The wheel-side reducer currently used is an additional set of gear transmissions that reduce speed and increase torque to meet the power matching needs of the entire transmission system. Installed at the power output terminal of the vehicle to reduce the load on the gearbox. Most of the existing wheel speed reducers adopt planetary gear structure and bevel gear structure. The sun gear of the planetary gear reduction mechanism is used to receive the power input of the motor, and the planet carrier of the planetary gear mechanism is used to output the power. The gearbox of this moving shaft reduction mechanism The structure is complex, there are many casting sand cores, the manufacturing cost is high, the production efficiency is low, the support rigidity is small and the power is small.

In view of this situation, there is a need for an electric hub with a wheel-side reduction device. The wheel-side reduction mechanism in the hub motor is a fixed-axis drive. This fixed-axis hub drive device has a simple structure, compact component assembly, and high support rigidity. , Large reduction ratio, high power, good lubrication function, long service life.

Contents of the invention

The purpose of the present invention is to provide an electric wheel hub with a wheel-side reduction device. The wheel-side reduction mechanism in the wheel hub motor is a fixed-axis drive. This fixed-axis type wheel hub drive device has a simple structure, compact assembly of components, and high support rigidity. , large reduction ratio, high power, good lubrication function, long service life;

The electric hub with the wheel speed reduction device of the present invention comprises a hub main shaft, a wheel hub rotatably fitted on the wheel hub main shaft, a wheel hub motor and a wheel speed reduction device arranged in the wheel hub, and the wheel speed reduction device includes The central gear that rotates with the hub main shaft, the ring gear coaxially fixed with the hub, and a plurality of double gears distributed around the hub main shaft, the central gear is used to distribute the power output by the hub motor to The bull gear of each dual gear, the pinion of each said dual gear meshes with said ring gear;

Further, the hub motor includes a stator assembly and a rotor assembly, the rotor assembly includes a rotor and a rotor bracket that is rotatably fitted to the hub main shaft, and the sun gear meshes with the bull gear of each duplex gear at the same time; the sun gear end The external spline sleeve is integrally formed with the outer spline sleeve and cooperates with the internal spline formed on the rotor bracket through the external spline sleeve;

Further, the stator assembly includes a cover-shaped outer stator, magnetic tiles distributed on the inner circle of the outer stator, and an outer stator bracket used to close the open end of the outer stator and fix the stator to the hub main shaft; the rotor bracket passes through the outer A first sealing ring is provided between the end face of the stator and the rotor bracket and the outer stator;

Further, the rotor bracket and the central gear are rotatably supported on the hub main shaft through two rotor supporting bearings and the central bearing supporting bearing respectively, and a bearing sleeve is provided between the two rotor supporting bearings and the two central bearing supporting bearings; Both the rotor support bearing and the center bearing support bearing are axially positioned through a shoulder and a snap ring on the hub main shaft;

Further, the duplex gear is interference-fitted on the duplex gear shaft, one end of the duplex gear shaft is rotatably supported on the end face of the outer stator, and the other end is rotatably supported on a support frame fixed to the hub main shaft;

The electric hub with the wheel speed reduction device of the present invention also includes a box body for accommodating the wheel hub motor and the wheel side speed reduction device, the box body includes a cylindrical box body and a box body for sealing The left end cover and the right end cover; the hub is fixed and covered outside the box body, and the ring gear is integrally formed on the inner circle of the box body; the left end cover is rotatably supported on the hub main shaft, and the right end cover can be The rotation is supported on the support frame.

Further, the left end cover is rotatably supported on the hub main shaft through the end cover support bearing; the inner ring of the end cover support bearing is positioned axially between the shoulder of the hub main shaft and the end face of the stator bracket, and the outer ring of the end cover support bearing is along the Axially positioned between the positioning ring integrally formed on the inner circle of the right end cover and the retaining ring fixed on the right end cover;

Further, the hub main shaft is a tube structure, and oil holes are provided on the tube wall of the hub main shaft.

The beneficial effects of the present invention are: in the electric wheel hub with the wheel side reduction device of the present invention, the wheel hub motor transmits power to the inner ring gear through the central gear and the double gear in turn, and the ring gear and the wheel hub are coaxially fixed to each other. Therefore, the ring gear The output power can drive the wheel hub to rotate. The central gear and the large gear of the double gear, the pinion of the double gear and the ring gear in the present invention are all reduction gear transmission pairs. Therefore, the wheel speed reduction device of the present invention Two-stage fixed-axis deceleration is formed. This fixed-axis hub drive device has a simple structure, compact assembly of components, high support rigidity, large reduction ratio, high power, good lubrication function, and long service life.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention will be further described

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a partial enlarged view of place I in Fig. 1 .

detailed description

Fig. 1 is a structural schematic diagram of the present invention, as shown in the figure: the electric hub 1 with the wheel side reduction device of this example includes the hub main shaft 7, the hub 1 that is rotatably fitted on the hub main shaft 7, and is arranged on the The hub 1 motor in the hub 1 and the wheel side reduction device, the wheel side reduction device includes a central gear 13 that is rotatably fitted to the hub main shaft 7, an inner ring gear 9 that is coaxially fixed with the hub 1 and surrounds the A plurality of dual gears 11 distributed on the main shaft of the hub, the central gear 13 is used to distribute the power output by the hub motor to the large gear of each dual gear 11, and the pinion of each of the dual gears 11 is meshed with The inner ring gear 9; the electric wheel hub with the wheel side reduction device in this embodiment, the hub motor transmits the power to the inner ring gear 9 through the central gear 13 and the double gear 11 in turn, and the inner ring gear 9 and the wheel hub are coaxial with each other Fixed, therefore, the power output by the inner ring gear can drive the wheel hub to rotate, between the central gear 13 and the large gear of the double gear 11 in the present invention, the pinion of the double gear 11 and the ring gear 9 are all reduction gear transmissions Vice, therefore, the wheel side reduction device of the present invention forms a two-stage fixed-axis reduction. This fixed-axis hub drive device has a simple structure, compact assembly of components, high support rigidity, large reduction ratio, high power, and good lubrication function , longer service life.

In this embodiment, the hub 1 motor includes a stator assembly and a rotor assembly, and the rotor assembly includes a rotor and a rotor bracket 8 that is rotatably fitted to the hub main shaft 7; Gear meshing; the end of the central gear 13 is integrally formed with an external spline sleeve and through the external spline sleeve is matched with the internal spline formed on the rotor bracket, the rotor assembly rotates so that the internal spline of the rotor bracket 8 can transfer power The transmission is transmitted to the external spline integrated with the central gear 13. This arrangement is conducive to simplifying the structure of the entire transmission mechanism and improving the reliability of the transmission.

In this embodiment, the stator assembly includes a cover-shaped outer stator 3, magnetic tiles 4 distributed on the inner circle of the outer stator 3, and an outer stator bracket for closing the open end of the outer stator 3 and fixing the stator to the hub main shaft 7 6. The rotor bracket 8 passes through the end face of the outer stator 3, and a first sealing ring 18 is provided between the rotor bracket 8 and the outer stator 3, and the outer stator 3 and the outer stator bracket 6 jointly form an outer part of a sealed box structure. The stator 3 assembly isolates the internal space of the stator from the deceleration device. The entire rotor assembly is located inside the outer stator 3 assembly. There is a through hole on the end surface of the outer stator 3. The rotor bracket 8 passes through the through hole, and its inner splines are in the through hole. In this embodiment, one end of the stator is fixedly connected to the hub main shaft 7 through bolts through the outer stator bracket 6, and the other end is in contact with the rotor support frame through the first sealing ring 18 to prevent lubricating oil Penetrates into the outer stator 3 interior.

In this embodiment, the rotor support 8 and the sun gear 13 are respectively supported in rotation on the hub main shaft 7 through two rotor support bearings and the sun gear support bearings, and the two rotor support bearings and the two sun gear support bearings are equally A bearing sleeve is provided; the rotor support bearing and the central gear support bearing support bearing are axially positioned through the shoulder on the hub main shaft 7 and the snap ring 17; the bearing sleeve is against the inner end faces of the two bearings to maintain The distance between the two bearings, the outer end surfaces of the two bearings are respectively offset against the shaft shoulder and the snap ring, therefore, the two rotor supporting bearings or the two central gear supporting bearings are axially positioned through the bearing sleeve, the shaft shoulder and the snap ring 17 , which has a simple structure and high positioning accuracy.

In this embodiment, the duplex gear 11 is interference-fitted with the duplex gear shaft 12, one end of the duplex gear shaft 12 is rotatably supported on the end surface of the outer stator 3, and the other end is rotatably supported on the hub main shaft 7. On the fixed support frame, the support frame is a disc structure and is fixed on the outer end surface of the hub main shaft 7 by bolts. The support frame is provided with bearing seat holes corresponding to the double gear shaft 12 one by one, and the end surface of the outer stator 3 There are also bearing seat holes corresponding to the dual gear shafts 12 one by one. Each dual gear shaft 12 is supported between the support frame and the end face of the outer stator 3 through bearings. This arrangement utilizes the outer stator 3 and the support frame Together as the support frame of the double gear shaft, it is beneficial to simplify the structure and assembly process of the two-stage fixed shaft gear mechanism. The support frame is also provided with a bearing end cover for sealing one end of the bearing seat hole.

The electric hub 1 with the wheel speed reduction device of this embodiment also includes a box body for accommodating the wheel hub 1 motor and the wheel side speed reduction device, the box body includes a cylindrical box body 2 and a box body for The left end cap 5 and the right end cap 10 that are closed by the body 2; the hub 1 is fixed and overlaid on the outside of the box body 2, and the ring gear 9 is integrally formed on the inner circle of the box body 2; the left end cap 5 is rotatably supported on the hub main shaft 7, and the right end cover 10 is rotatably supported on the support frame. This structure enables the hub 1 motor and the wheel side reduction device to be arranged in a sealed environment to prevent dust and impurities from entering the interior of the electric hub 1. The ring gear 9 is integrated with the inner circle of the box body, which simplifies the number of parts of the whole device. The inner circle of the hub 1 is integrally formed with a positioning ring, which is clamped on the end surface of the box body 2 and the right end cover 10 The three are fastened by bolts. The outer end surface of the support frame is integrally formed with a sealing ring seat, and a second sealing ring 12 is installed on the sealing ring seat. The second sealing ring 12 is used to connect the support frame and the right end. A seal is formed between the covers 10 .

In this embodiment, the left end cover 5 is rotatably supported on the hub main shaft 7 through the end cover support bearing 20; as shown in FIG. Between the end surfaces of the stator brackets, the outer ring of the end cover support bearing 20 is axially positioned between the positioning ring integrally formed on the inner circle of the right end cover 10 and the retaining ring 19 fixed on the right end cover 10 .

In this embodiment, the hub main shaft 7 is a tube structure, and the tube wall of the hub main shaft 7 is provided with oil holes 14, and two groups of oil holes 14 are arranged, and each group of oil holes 14 is evenly distributed on the hub main shaft 7 along the circumferential direction. Above, one group of oil holes 14 corresponds to the rotor bracket 8 , and the other group of oil holes 14 corresponds to the dual gear 11 .

The above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced. Without departing from the purpose and scope of the technical solutions of the present invention, all of them should be included in the scope of the claims of the present invention.

Claims (8)

1. An electric hub with a wheel-side reduction device, characterized in that: it comprises a hub main shaft, a hub rotatably fitted on the hub main shaft, a hub motor and a wheel-side reduction device arranged in the hub, the The wheel side reduction device includes a central gear that is rotatably fitted to the hub main shaft, an internal ring gear fixed coaxially with the hub, and a plurality of double gears distributed around the hub main shaft, and the central gear is used to drive the hub motor The output power is distributed to the large gear of each dual gear, and the pinion of each dual gear meshes with the ring gear. 2. The electric hub with a wheel-side reduction device according to claim 1, characterized in that: the hub motor includes a stator assembly and a rotor assembly, the rotor assembly includes a rotor and a rotor bracket that is rotatably fitted to the hub main shaft, the The central gear meshes with the large gear of each duplex gear at the same time; the end of the central gear is integrally formed with an external spline sleeve and is matched with an internal spline formed on the rotor bracket through the external spline sleeve. 3. The electric hub with a wheel-side reduction device according to claim 2, characterized in that: the stator assembly includes a cover-shaped outer stator, magnetic tiles distributed on the inner circle of the outer stator, and used to connect the open end of the outer stator The stator is closed and fixed to the outer stator support of the hub main shaft; the rotor support passes through the end face of the outer stator, and a first sealing ring is arranged between the rotor support and the outer stator. 4. The electric hub with a wheel-side reduction device according to claim 3, characterized in that: the rotor bracket and the sun gear are rotatably supported on the hub main shaft through two rotor support bearings and the sun gear support bearing respectively A bearing sleeve is arranged between the two rotor support bearings and the two center bearing support bearings; the rotor support bearings and the center bearing support bearings are axially positioned through the shoulder and the snap ring on the hub main shaft. 5. The electric hub with a wheel-side reduction device according to claim 4, characterized in that: the duplex gear is interference-fitted on the duplex gear shaft, and one end of the duplex gear shaft is rotatably supported on the outer stator The other end is rotatably supported on a support frame fixed to the hub main shaft. 6. The electric hub with a wheel-side reduction device according to claim 1, characterized in that: it also includes a box for accommodating the wheel-hub motor and the wheel-side reduction device, and the box includes a cylindrical box The main body and the left end cap and right end cap used to close the box body; the hub is fixed and covered outside the box body, and the ring gear is integrally formed on the inner circle of the box body; the left end cap It is rotatably supported on the hub main shaft, and the right end cover is rotatably supported on the support frame. 7. The electric hub with a wheel-side reduction device according to claim 6, characterized in that: the left end cover is rotatably supported on the hub main shaft through the end cover support bearing; the inner ring of the end cover support bearing is axially positioned on Between the shoulder of the hub main shaft and the end face of the stator bracket, the outer ring of the end cover support bearing is axially positioned between the positioning ring integrally formed on the inner circle of the right end cover and the retaining ring fixed on the right end cover. 8 . The electric hub with wheel side reduction device according to claim 6 , characterized in that: the hub main shaft is a tube structure, and an oil hole is provided on the tube wall of the hub main shaft.